#define _CRT_SECURE_NO_WARNINGS 1
struct ListNode* FindKthToTail(struct ListNode* pListHead, int k) {
    struct ListNode* slow = pListHead;
    struct ListNode* fast = pListHead;



    while (k--)
    {
        if (fast == NULL)
        {
            return NULL;
        }
        fast = fast->next;

    }
    while (fast)
    {
        slow = slow->next;
        fast = fast->next;
    }
    return slow;


}